Japan

Anthropic Sued by Music Publishers: Why Claude’s Training Data Faces a Billion-Dollar Legal Threat

AsiaAI Publisher · August 31, 2026 · 2 min read · Source: ITmedia AI+

Policy & Regulation

What this means

Why it matters: This case is not just about a large payout; it reveals the growing playbook for content industries to challenge AI developers over training data. The claims about removing copyright management information and Claude’s ability to reproduce lyrics verbatim are direct attacks on the ‘fair use’ defense, suggesting intentional rather than incidental infringement. This escalates the legal and financial risk for any large language model developer.

For Western readers: Western AI developers should immediately review their data sourcing and cleaning practices for any potential ‘destructive scanning’ or deliberate removal of copyright information, as these are now explicit targets for content owners. Assume that a successful defense in this case or similar ones will require absolute transparency and provable ethical sourcing, not just a claim of ‘fair use.’

What to watch: Monitor the court’s stance on ‘destructive scanning’ and the deliberate removal of copyright management information, as these elements could significantly reshape the legal landscape for AI training data.

Sony Music Publishing and Warner Chappell Music, along with other music publishers, have filed a lawsuit against Anthropic, its CEO Dario Amodei, and co-founder Benjamin Mann for copyright infringement. The lawsuit, filed in a California federal court, alleges that Anthropic used pirated music lyrics and sheet music from illegal sites like LibGen and PiLiMi to train its Claude AI model, describing it as “one of the largest and most blatant intellectual property thefts in history.” The plaintiffs also claim Anthropic intentionally removed copyright management information during data cleaning and that Claude can reproduce lyrics verbatim.

This lawsuit follows a previous class-action settlement by Anthropic with authors for $1.5 billion over similar allegations of using pirated books. The music industry is now applying similar legal pressure, with potentially billions of dollars in damages sought, indicating a broad front of content owners challenging AI developers.

For the wider picture, see Japan AI Policy and Regulation.

Original source (Japanese)

ソニー・ミュージックパブリッシングとワーナー・チャペル、Anthropicを著作権侵害で提訴

ITmedia AI+

This story appeared in AsiaAI.FYI Issue #82.